Phytophthora root rot is a well-known disease to Iowa soybean growers. Although the disease has been under control, with no large-scale severe outbreaks, it continues to be a production concern and causes damage in scattered areas because of the development of new races. In the last 2 years, reports have increased for Phytophthora root rot from varieties with the Rps1k gene (or k-gene). Despite the relatively dry spring thus far, we have received reports of Phytophthora root rot on varieties with the Rps1k gene.
Iowa State University
Yang, X. B. and Uphoff, Michael D., "Races of Phytophthora" (2000). Integrated Crop Management News. 2077.
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